Cutting tool



Jarl- 22, A1952 w. J. suoDERBcK Erm. 2,583,309

i CUTTING TOOL Y Filed May I2'?, 1946 ...y @NGT Patented `an. 22, i952William J. Sloderbeck and -William HfFritz, Sr.,

Southfield Township, OaklandrCounty, Mich., assignors to Goddard andGoddard Company, Detroit, Mich., a corporation of Michigan ApplicationMay 27, 1946, VSerial No. 672,614

s claims.' (c1. :e9-105) This invention relates generally yto cuttingtools and refers more particularly to improvements in the constructionof inserted blade type cutters.l

In the manufacture of certain inserted blade cutters, it has been thepractice to form the body of the cutter of one piece construction and tomill or otherwise form two series of circumferentially spaced bladereceiving slots in the periphery thereof with the slots in one seriesstaggered with respect to the slots in the other series. Also, the slotsin one series are arranged to open through one face of the cutter andthe slots in the other series open through the oppol site face of thecutter. The construction is such that the blades in the two series ofslots extend beyond the periphery of the body and respec tively projectbeyond opposite sides of the body to enable fashioning channels with thecutter assembly.

One of the disadvantages of the above type of cutter or cutterconstruction is the high cost of manufacture. For example, the millingof slots in the body of the cutter for the blades is very expensive duetothe fact that the slots are open atthe outer ends only and are closedat their inner ends.

The above characteristic or manufacturing re-` quirement results inproducing a second serious disadvantage of the type of cutter previouslymentioned. Owing to the fact that the inner ends of the slots areclosed, the slots must be longer than required in order toV provideample clearancespace for the milling cutter and this space must eitherbe lled by shaping the inner ends of the blades and locking wedgeelements or must be left open. Shaping the inner ends of the blades andwedge elements to ll the spaces adds materially to the cost of thecutter, and if the spaces are left open they form pockets which collectchips and foreign matter during performance of the cutter whichseriously interfere with efficient operation of the cutter.

A third objectionable feature of the above general type of cutter is itsinability to positively hold the cutter blades from slipping or movingin a direction parallel to the vslots under the pressure resulting fromthe cutting operation. The principal object of this invention is toovercome the above objections, and this is ac-A by welding or byotherwise securing the sections together.

The above feature greatly reduces the cost of manufacture -of Vthecutter, because it enables ends of the blades and inner faces ofthecutter cutters having provision for cutting at both sides body sectionsaccomplishes the further function of preventing endwise movement of thecutter blades under stresses resulting from cutting pressures.

Y Still another object of this invention is to taper the inner edges ofthe blades axially outwardly from the radially inner edges of the bladesto the radially outer edges thereof and to correspondingly taper theinner surfaces of the body sections engaged by the inner edges of theblades. Thus, adjustment of the blades radially outwardly preparatory togrinding the outside diameter of the cutter automatically shifts theblades axially outwardly to provide grinding stock at the sides of thecutter for maintenancelof a predetermined width of cut. As a result,initial grinding of the cutter to specied diameters and widths is notonly simplified but, in addition, maintenance of the cutter is greatlyfacilitated and reduced in cost.

The foregoing as well as other objects will be made more apparent asthis description proceeds, especially when considered in connection withthe accompanying drawing, wherein:

4Figure 1 is an elevational view of an inserted tooth cutter havingcertain parts broken away for the sake of clearness and embodying thefeatures of this invention; and

` Figure 2is a fragmentary sectional view taken i substantially on theplane indicated by the line 2 2 of Figure 1.

The invention is specifically illustrated herein in connection withrotary inserted blade type and at the periphery thereof. This type ofrotary cutter' is particularly useful for fashioning channel-shaped cutsin Vworkpieces, although it will be understood as this `descriptionproceeds,` that many of the features of this invention are the two bodysections are secured together by a ring-type weld, although it will beundelSiQQd that other methods of securing may be employed. For example,the two body sectionsmaybespon welded at circumferentiallyspacedpoints-around the periphery thereof, or the sections. may-be bolted orpinned together.

In any case the peripheralY portion. of `veach.

section of the body is formed with'slots 'I 4 spaced" equal distancesfrom each other circumferentially of the section and extending from theOuter. sideA f the.. .Section X60. the. inner .Sidel 0f the latter.Theinner sides of ,bothbodx seciionsere als@ formedwith recesses. l5spaced from 'each other in a manner towpermitthe recesses in onetsectiontomregister with the rear ends 0f the Slots' ,I4 inthe other sectionwhen the two sections ,are in lassenpbledrelationship. Thus, the innerends ofthe two series -lof, slots in therespeetive bodydlsections arevclosed by the walls .I6 of the recesses I5, and forthe. purpose of thisdescription, the walls Ismay be considered` portions of the inner sidesvof the two body `sections.

A cutting blade I'I is positioned in each slot I4 andthe inner ends ofthe blades vin the slots I4 in one section projectrinto the registeringrecesses I5 formed in the inner sideof the` otherusection. As shownI'iarticularly` in'Figure l of the draw-l ing, the inner ends I8 ofthe`Ibladesuabut the walls I6 ofthe 'registering recesses I5 to avoid theformation of clearaneespacesat thetinner ends of th'e'blades inwhichnohips anclother foreign matter may'accurnulatem The radially outeredges I9`-of`thebladestl1 projectbeyond the periph'ery of the., body I0,t9' prende, cutting .edges and the'axially outer Vedges 2l)v of the twosets of blades `on the respectivey sections proj ect beyond the'out'e'rside ofthe .body toprovide side cutting edges on the bladesn"K Inaccordance with conventionalpractice, serrations 2'I` Aar'e'forme'd inonemside of each blade I'I andextendfrom the axially outerviedge of theune to th; axailrinnewde .or nearer.; These Vserrationsmare adaptedtomesh with thev corresponding `serrations 22 formed in theadjacent'sidsaof the slots I4. Inthepresenvtlinstance, the serrations 2lon the bladesrare held in meshing relationship with the serrations 22 bytapered` clamping members 23 respectivelypositioned in the slots I4' andsecured in place by set screws 24. The axially inner ends of theclamping members '23 associated with one body section abutthe inner'side ofthe other body section, so as to avoid the formation ofclearance spacesdwithin which., chips or other foreign matter 'may'accumulate.

By engaging the axially inner ends ofA the'A blades I'I and clampingmembers 23 with thel inner sides.

of the body sections, chip pockets are` not only omitted, but the bladesare heldlin their respec-gVL tive pockets against movement regardless ofthe terrific cuttingpressures applied theretoduring operation.

Referring again togFigure 1 of the drawing, it

will be' noted that vthe walls I8 of the recesses I5 are tapered 'from'`the bottomportions of theI recesses toward the aclrja'cent'ends o'f thevslots asasoe registering with the recesses and the inner ends of theblades II are correspondingly tapered. As a result the blades I'I areshifted axially outwardly in response to movement of the blades radiallyoutwardly in their respective slots I4. This arrangement is highlyadvantageous in that it not only simplifies initial grinding of thecutter to a preselected diameter and width but, in addition, greatlyreduces maintenance cost. In other Words, adjustment of the blades foroutside diameter grinding automatically provides grinding Stocktonvtheouter. ends of the blades to enable maintaining-ther width of thecut to a specied dimension.

In manufacture the slots I4 and the recesses I5arertnilled-,or otherwiseformed in the peripheral portions of the body sections before the latterare assembled or secured together. After the slots I4 and recesses I5have been properly formed in the respective body Asections,'the'latterare positionedso thatthe-recesses I5 in one section'register with. theslots .I4 vin the other section, and the two sections are weldedtogether while -held in the above relativeposition.

What we claim as our invention is:

1., A.-rotary.insertedV blade type cutter having an annular bodycomprising two ring-like sections permanently secured together with theadjacent surfa'ces kin bearing engagement, the peripheralv portionlof--onesection having circumferentially spaced bladereceiving slotsextending4 from the yfront side ofsaid one-section to the inner side ofthe latterand 'having the inner ends oftheslots closedby-theadjacentinner side of theother section, blades positioned in the slotswith-the inner ends-abutting vthe-inner side of the-said-other section,the inner ends of the bladesI being tapered axially :outwardly from theradially inner edges of the blades to the radially outer edges of theblades' and-the portions of the said other section .whichA abut theinner ends of vthe blades -being correspondingly'tapered whereby theblades are shiftedaxially outwardly in response to movement of theblades radially outwardly,and means forfremovablyr clamping the bladesin the slots.

2. A rotary'inserted-blade type cutter having an annular bodycomprising'two ring-like sections permanently secured together rwith theadjacent surfacesin bearingl engagement, the peripheral portion ofeachjsection''havingV blade receiving slotsextendingl from: the outersides of the sections to the Yinner* sides ofthe latter and ythe slotsin one section-fbeing staggered with respect to the -slots ini'lheqotherl section whereby the inner ends of the Yslots are closed bythe inner surfaces of the sections, bladesypositioned in the slots withthe inner ends abutting the inner surfaces of the sections, ,thel inner.ends ofthe blades being tapered'axiallyitoutwardly from the radiallyinner edges `of Ythe blades and'k the portions of inner surfaces ofthe'sections which engage vthe inner ,n ends'of the blades being.correspondinglyV tapered each ,of saidsections having blade-receivingslots of uniform axial cross-section extending com-.-

pletely through the section from side to side and opening at theperiphery. the inner side surface of each section having recessestherein in registry with the slots in the other sections said recessesfl` having inclined inner walls forming the ends of blade receivingpockets partly defined by the siclcf` walls of the slots which areinclined outwardlyof the body from a radial plane to provide for:

axially outward displacement of blades in the pockets upon radiallyoutward adjustment of the blade with their inner ends in contact withthe inner walls of the recesses.

WILLIAM J. SLODERBECK. WILLIAM H. FRITZ, Sn.

REFERENCES CITED The following references are of record in the le ofthis patent:

Number Number l5 562,897

6 UNITED STATES PATENTS Name Date West Oct. 8, 1901 McQuestion Mar. 2,1920 Stull May 28, 1929 Irwin Aug. 30, 1932 Severson Jan. 20, 1940Miller Jan. 26, 1943 Wenzel Jan. 11, 1944 Francis June 5, 1945 MillerFeb. 19, 1946 FOREIGN PATENTS Country Date Great Britain July 20, 1944

